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JMockit is a Java toolkit for developer (unit/integration) testing. It contains mocking APIs and other tools, supporting both JUnit and TestNG. The mocking APIs allow all kinds of Java code, without testability restrictions, to be tested in isolation from selected dependencies.

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/*
 * Copyright (c) 2006-2013 Rogério Liesenfeld
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.integration.junit3.internal;

import java.lang.reflect.*;

import junit.framework.*;

import mockit.integration.internal.*;
import mockit.internal.state.*;
import mockit.internal.util.*;

final class JUnitTestCaseDecorator extends TestRunnerDecorator
{
   private static final Method setUpMethod;
   private static final Method tearDownMethod;
   private static final Method runTestMethod;
   private static final Field fName;

   static
   {
      try {
         setUpMethod = TestCase.class.getDeclaredMethod("setUp");
         tearDownMethod = TestCase.class.getDeclaredMethod("tearDown");
         runTestMethod = TestCase.class.getDeclaredMethod("runTest");
         fName = TestCase.class.getDeclaredField("fName");
      }
      catch (NoSuchMethodException e) {
         // OK, won't happen.
         throw new RuntimeException(e);
      }
      catch (NoSuchFieldException e) {
         // OK, won't happen.
         throw new RuntimeException(e);
      }

      setUpMethod.setAccessible(true);
      tearDownMethod.setAccessible(true);
      runTestMethod.setAccessible(true);
      fName.setAccessible(true);
   }

   void runBare(TestCase testCase) throws Throwable
   {
      updateTestClassState(testCase, testCase.getClass());

      prepareForNextTest();
      TestRun.setRunningIndividualTest(testCase);

      try {
         originalRunBare(testCase);
      }
      catch (Throwable t) {
         StackTrace.filterStackTrace(t);
         throw t;
      }
      finally {
         TestRun.setRunningIndividualTest(null);
      }
   }

   private void originalRunBare(TestCase testCase) throws Throwable
   {
      setUpMethod.invoke(testCase);

      Throwable exception = null;

      try {
         Method testMethod = findTestMethod(testCase);
         executeTestMethod(testCase, testMethod);
      }
      catch (Throwable running) {
         exception = running;
      }
      finally {
         TestRun.finishCurrentTestExecution(true);
         exception = performTearDown(testCase, exception);
      }

      if (exception != null) {
         throw exception;
      }
   }

   private Method findTestMethod(TestCase testCase) throws IllegalAccessException
   {
      String testMethodName = (String) fName.get(testCase);

      for (Method publicMethod : testCase.getClass().getMethods()) {
         if (publicMethod.getName().equals(testMethodName)) {
            return publicMethod;
         }
      }

      return runTestMethod;
   }

   private void executeTestMethod(TestCase testCase, Method testMethod) throws Throwable
   {
      SavePoint savePoint = new SavePoint();
      TestRun.setSavePointForTestMethod(savePoint);

      Throwable testFailure = null;

      try {
         Object[] mockParameters = createInstancesForMockParameters(testCase, testMethod, null, savePoint);
         createInstancesForTestedFields(testCase);

         if (mockParameters == null) {
            runTestMethod.invoke(testCase);
         }
         else {
            testMethod.invoke(testCase, mockParameters);
         }
      }
      catch (InvocationTargetException e) {
         e.fillInStackTrace();
         testFailure = e.getTargetException();
      }
      catch (IllegalAccessException e) {
         e.fillInStackTrace();
         testFailure = e;
      }
      catch (Throwable thrownByTest) {
         testFailure = thrownByTest;
      }
      finally {
         concludeTestMethodExecution(savePoint, testFailure, false);
      }
   }

   private Throwable performTearDown(TestCase testCase, Throwable thrownByTestMethod)
   {
      try {
         tearDownMethod.invoke(testCase);
         return thrownByTestMethod;
      }
      catch (Throwable tearingDown) {
         return thrownByTestMethod == null ? tearingDown : thrownByTestMethod;
      }
      finally {
         TestRun.getExecutingTest().setRecordAndReplay(null);
      }
   }
}